Santorum responds to Romney tax plan: 'Welcome to the party, governor'

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Santorum's comments came a few hours after Romney released his tax plan, which would cut the top tax rate from 35 percent to 28 percent and cut the bottom tax rate from 10 percent to 8 percent. 

Likewise, Santorum's plan cuts the top tax rate to 28 percent and installs a 10 percent bracket. 

Santorum introduced his tax plan in a speech at the Detroit Economic Club a week earlier. He also proposes shrinking government spending by a trillion dollars over the next five years.

"And we will reach a balanced budget in five years," the former Pennsylvania senator said.

In response, a spokesman for Romney said Santorum's plan increases the deficit.

"It's no surprise that Senator Santorum would try to associate himself with Governor Romney's conservative, pro-growth plan to cut taxes and grow the economy," Romney spokesperson Andrea Saul said in a statement. "But there are crucial differences.  First, Governor Romney's plan will not explode the deficit in the way that Senator Santorum's will."

Saul added that Santorum's plan picks "winners and losers" and that Romney "has the leadership experience necessary to actually get his pro-growth plan passed into law."

—This story was updated at 4:11 p.m.